220312240 has 20 divisors (see below), whose sum is σ = 512226144. Its totient is φ = 88124864.

The previous prime is 220312237. The next prime is 220312241. The reversal of 220312240 is 42213022.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (220312241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1376872 + ... + 1377031.

Almost surely, 2^220312240 is an apocalyptic number.

220312240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220312240 is an abundant number, since it is smaller than the sum of its proper divisors (291913904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220312240 is a wasteful number, since it uses less digits than its factorization.

220312240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753916 (or 2753910 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 220312240 is about 14842.9188504148. The cubic root of 220312240 is about 603.9665347013.

Adding to 220312240 its reverse (42213022), we get a palindrome (262525262).

The spelling of 220312240 in words is "two hundred twenty million, three hundred twelve thousand, two hundred forty".